Air pump



FIG. 1 is a front, top and left side perspective view of an air pump, showing my new design;

FIG. 2 is a front, top and left side perspective view of the air pump with the handle in a folded state;

FIG. 3 is a front view of the air pump of FIG. 1 ;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the drawings illustrate the portions of the air pump, which form no part of the claimed design. 

CLAIM The ornamental design for an air pump, as shown and described. 